LP3891ET-1.5 Description
The LP3891ET-1.5 is a high current, fast response regulator which can maintain output voltage regulation with minimum input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: Vbias provides voltage to drive the gate of the N-MOS power transistor. At the same time, Vin is the input voltage that supplies power to the load. The use of an external bias rail allows the part to operate from ultra-low Vin voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current.
LP3891ET-1.5 Features
Ultra Low Dropout Voltage (100mV at 0.8A typ)
Low Ground Pin Current
Load Regulation of 0.04%/A
60 nA Typical Quiescent Current in Shutdown
1.5% Output Accuracy (25°C)
TO-220, DDPAK/TO-263 and SO PowerPAD-8 Packages
Over Temperature/Over Current Protection
-40C to +125°C Junction Temperature Range
LP3891ET-1.5 Applications
DSP Power Supplies
Server Core and /O Supplies
PC Add-in-Cards
Local Regulators in Set-Top Boxes
Microcontroller Power Supplies
High-Efficiency Power Supplies
SMPS Post-Regulators
